==== tests/cases/compiler/baseTypePrivateMemberClash.ts (1 errors) ====
    class X {
        private m: number;
    }
    class Y {
        private m: string;
    }
    
    interface Z extends X, Y { }
              ~
!!! error TS2320: Interface 'Z' cannot simultaneously extend types 'X' and 'Y':
!!! error TS2320:   Named properties 'm' of types 'X' and 'Y' are not identical.